[llvm-bugs] [Bug 37859] New: LoopUnroll introduces infinite loop with nested loops

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jun 19 12:43:33 PDT 2018


            Bug ID: 37859
           Summary: LoopUnroll introduces infinite loop with nested loops
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: Matthew.Arsenault at amd.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20445
  --> https://bugs.llvm.org/attachment.cgi?id=20445&action=edit

In the attached testcase, there are two nested loops with constant trip counts.
The exit isn't fully eliminated. 

opt -loop-unroll -gvn shows a strange infinite loop is introduced instead.

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